Pocket knife



FIG. 1 is a side elevational view of a pocket knife showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is an opposite side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is an end elevational view thereof; and

FIG. 6 is an opposite end elevational view thereof. 

The ornamental design for a pocket knife, as shown and described. 